• Full upward compatibility with standard 8051 microcontroller
• Up to 16 MHz external operating frequency
– 750 ns instruction cycle at 16 MHz operation
• On-chip program memory
– C513AO-2R: 16 Kbytes ROM (with optional ROM protection)
– C513AO-2E: 16 Kbytes OTP
– C513AO-L: version without on-chip program memory (ROMless)
• Up to 64K byte external data memory
•256 ×8 RAM
•256 ×8 XRAM
• Four 8-bit digital I/O ports
• Three 16-bit timers/counters (Timer 2 with Up/Down and 16-bit auto-reload features)
• Full duplex serial interface (USART)
• Synchronous Serial Channel (SSC)
• Seven interrupt sources with two priority levels
• On-chip emulation support logic (Enhanced Hooks Emulation Technology™)